SYNTHESIS AND THERMAL-PROPERTIES OF SOME AROMATIC CO-POLYHYDRAZIDES CONTAINING AN ETHER LINKAGE IN THE MONOMER UNIT

Some new co-polyhydrazides were synthesized using a low-temperature so lution polycondensation technique. Polycondensation of hydroquinone 1, 4-diacetic acid dihydrazide (1) and 2-bromo-, 2-chloro- and 2-nitrohyd roquinone-1,4-diacetic acid dihydrazide (2, 3 and 4) with terephthaloy l or isophthaloyl chloride in dimethyl-formamide gave the correspondin g co-polyhydrazides (5-12), respectively. Their thermal analysis, solu bility in different solvents and the effects of variable reaction cond itions on the yield percents and viscosity values are studied. The str uctures of the prepared co-polyhydrazides were confirmed by elemental analysis, infrared (i.r.) and H-1-NMR spectroscopy. (C) 1997 Elsevier Science Limited.